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<title>非常小巧的JS下拉菜单代码</title>
<style>
#sddm
{	margin: 0 auto;
	padding: 0;
	z-index: 30;
	background-color:#F4F4F4;
	width: 480px;
	height:23px;}

#sddm li
{	margin: 0;
	padding: 0;
	list-style: none;
	float: left;
	font: bold 12px arial}

#sddm li a
{	display: block;
	margin: 0 1px 0 0;
	padding: 4px 10px;
	width: 60px;
	background: #5970B2;
	color: #FFF;
	text-align: center;
	text-decoration: none}

#sddm li a:hover
{	background: #49A3FF}

#sddm div
{	position: absolute;
	visibility: hidden;
	margin: 0;
	padding: 0;
	background: #EAEBD8;
	border: 1px solid #5970B2}
#sddm div a
	{	position: relative;
		display: block;
		margin: 0;
		padding: 5px 10px;
		width: auto;
		white-space: nowrap;
		text-align: left;
		text-decoration: none;
		background: #EAEBD8;
		color: #2875DE;
		font: 12px arial}

	#sddm div a:hover
	{	background: #49A3FF;
		color: #FFF}
</style>
<!-- dd menu -->
<script type="text/javascript">
<!--
var timeout = 500;
var closetimer= 0;
var ddmenuitem = 0;
// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose; 
// -->
</script>
</head>
<body style="text-align:center">
<ul id="sddm">
	<li><a href="#" onmouseover="mopen('m1')" onmouseout="mclosetime()">主页</a>
		<div id="m1" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
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		<a href="#">ASP源程序</a>
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		<a href="#">DIV布局实例</a>
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		<a href="#">下载帮助文档</a>
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	<li><a href="#" onmouseover="mopen('m5')" onmouseout="mclosetime()">联系博主</a>
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		<a href="http://www.codefans.net/" target="_blank">博主官网</a>
		</div>
	</li>
</ul>

<div style="clear:both"></div>
<p><p>非常小巧的JS下拉菜单代码，兼容：IE6+, Firefox 1.5+, Opera 8+, Safari 3+, Chrome 0.2+</p></p>
</body>
</html>